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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56acaf25e14031b362511169c8f60a52c89ceedc8789a4000d1f4cae6b1ddbc9' 
  AND token = 'slQbKFZWOKRqUxSjnd+plEzUobEd0iR/8qyXqqlF8o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}